Keck observatory laser guide star adaptive optics discovery and characterization of a satellite to the large kuiper belt object 2003 EL 61

M. E. Brown, A. H. Bouchez, D. Rabinowitz, R. Sari, C. A. Trujillo, M. Van Dam, R. Campbell, J. Chin, S. Hartman, E. Johansson, R. Lafon, D. Le Mignant, P. Stomski, D. Summers, P. Wizinowich

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The newly commissioned laser guide star adaptive optics system at Keck Observatory has been used to discover and characterize the orbit of a satellite to the bright Kuiper Belt object 2003 EL61. Observations over a 6 month period show that the satellite has a semimajor axis of 49,500 ± 400 km, an orbital period of 49.12 ± 0.03 days, and an eccentricity of 0.050 ± 0.003. The inferred mass of the system is (4.2 ± 0.1) × 1021 kg, or ∼32% of the mass of Pluto and 28.6% ± 0.7% of the mass of the Pluto-Charon system. Mutual occultations occurred in 1999 and will not occur again until 2138. The orbit is fully consistent neither with one tidally evolved from an earlier closer configuration nor with one evolved inward by dynamical friction from an earlier more distant configuration.

Original languageEnglish (US)
Pages (from-to)L45-L48
JournalAstrophysical Journal
Volume632
Issue number1 II
DOIs
StatePublished - Oct 10 2005
Externally publishedYes

Keywords

  • Comets: general
  • Infrared: solar system
  • Minor planets, asteroids

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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